Add echo-go sample

Signed-off-by: Marcus Brandenburger <bur@zurich.ibm.com>

samples/chaincode/echo-go/.gitignore

@@ -0,0 +1,7 @@
+ecc
+ecc-bundle
+enclave.json
+private.pem
+public.pem
+mrenclave
+details.env

samples/chaincode/echo-go/Makefile

@@ -0,0 +1,9 @@
+# Copyright 2019 Intel Corporation
+# Copyright IBM Corp. All Rights Reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+TOP = ../../..
+include $(TOP)/ecc_go/build.mk
+
+CC_NAME ?= fpc-echo-go

samples/chaincode/echo-go/chaincode/echo.go

@@ -0,0 +1,27 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package chaincode
+
+import (
+	"fmt"
+
+	"github.com/hyperledger/fabric-chaincode-go/shim"
+	pb "github.com/hyperledger/fabric-protos-go/peer"
+)
+
+type Echo struct {
+}
+
+func (t *Echo) Init(stub shim.ChaincodeStubInterface) pb.Response {
+	return shim.Success(nil)
+}
+
+func (t *Echo) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
+	functionName, params := stub.GetFunctionAndParameters()
+	fmt.Println("EchoCC: Function:", functionName, "Params:", params)
+	return shim.Success([]byte(functionName))
+}

samples/chaincode/echo-go/main.go

@@ -0,0 +1,43 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+Copyright 2020 Intel Corporation
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package main
+
+import (
+	"os"
+
+	"github.com/hyperledger/fabric-chaincode-go/shim"
+	fpc "github.com/hyperledger/fabric-private-chaincode/ecc_go/chaincode"
+	"github.com/hyperledger/fabric-private-chaincode/samples/chaincode/echo-go/chaincode"
+)
+
+func main() {
+
+	// we can control logging via FABRIC_LOGGING_SPEC, the default is FABRIC_LOGGING_SPEC=INFO
+	// For more fine-grained logging we could also use different log level for loggers.
+	// For example: FABRIC_LOGGING_SPEC=ecc=DEBUG:ecc_enclave=ERROR
+
+	ccid := os.Getenv("CHAINCODE_PKG_ID")
+	addr := os.Getenv("CHAINCODE_SERVER_ADDRESS")
+
+	// create private chaincode
+	privateChaincode := fpc.NewPrivateChaincode(&chaincode.Echo{})
+
+	// start chaincode as a service
+	server := &shim.ChaincodeServer{
+		CCID:    ccid,
+		Address: addr,
+		CC:      privateChaincode,
+		TLSProps: shim.TLSProperties{
+			Disabled: true, // just for testing good enough
+		},
+	}
+
+	if err := server.Start(); err != nil {
+		panic(err)
+	}
+}